程序仅读取.txt文件java中的最后一行

Question

I have a problem and don't know what to do. This method is supposed to read all the text in a .txt document. My problem is when the document contains more then one line of text and the program only read the last line. The program don't need to worry about signs like . , : or spaces, but it have to read all the letters. Can anybody help me?

example text

hello my name is (returns the right result)

hello my

name is

(returns only name is)

private Scanner x;
String readFile(String fileName)
{
  try {
    x = new Scanner (new File(fileName + (".txt")));
  }
  catch (Exception e) {
    System.out.println("cant open file");
  }
  while (x.hasNext()) {
    read = x.next(); 
  } 
  return read;
}

Answer 1

It's because when you use read = x.next() , the string in the read object is always being replaced by the text in the next line of the file. Use read += x.next() or read = read.concat(x.next()); instead.

Answer 2

You replace every read with every read() . Also, you didn't close() your Scanner . I would use a try-with-resources and something like,

String readFile(String fileName)
{
  String read = "";
  try (Scanner x = new Scanner (new File(fileName + (".txt")));) {
    while (x.hasNextLine()) {
      read += x.nextLine() + System.lineSeparator(); // <-- +=
    } 
  } catch (Exception e) {
    System.out.println("cant open file");
  }
  return read;
}